Finding the Fourth Proportional to 1,442.39, 1,991.57 and 883.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.39 : 1,991.57 = 883.63 : x
2. Step 2: Convert to fraction form
   1,442.39/1,991.57 = 883.63/x
3. Step 3: Cross multiply
   1,442.39x = 1,991.57 × 883.63
4. Step 4: Simplify right side
   1,442.39x = 1,759,802.84
5. Step 5: Solve for x
   x = 1,759,802.84/1,442.39
6. Step 6: Final answer
   x = 1,220.06